1. Install the battery according to the positive and negative poles. After the battery is installed, it will not heat up automatically. Press the top lid for 3-5 seconds to start heating.2. After preheating, seal the mouth of the bag, put the bag to be sealed between the heating part of the sealing machine and the top cover, and squeeze to move in a straight line.3. After the sealing is completed, the sealing machine is passed, the sealing performance is good, there is no leakage, and it can be safely stored to prevent food from getting wet.4. Remove the protective cover after use, and remove the protective cover above the heating part after use, which is safer.